This is the sort of thing I was getting at. Thanks for the links Kit, especially Part 1. Also what Ltl said about Tate's advice.

When I first started all I wanted to do was win. I was naturally fat so I was very aware of weight categories, I actually competed in the 110kg category once after only a couple years of training and I was shit there. I dropped past the 100's, past 90 and into the 82.5kg where I was lean and muscular and did most of my lifting. Nowadays I weigh in at a relatively smooth 95kg, 90kg is definitely much more like it. If however I was to push it and diet down really slowly then 85kg (cutting water to 82.5) would be a possibility if I were ripped. If I could hold onto my strength at that bodyweight and bodyfat level, I'd be very competitive.

That's the sort of thing I was wondering about, considering I've been training for well over a decade now and have a relatively light bone structure I don't envision much going much higher than the 82kg class while i'm in shape. According to the Casey Butt potential calculator that is pretty much spot on too.